Module: BrighterPlanet::Purchase::CarbonModel

Defined in:
lib/purchase/carbon_model.rb

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
 
# File 'lib/purchase/carbon_model.rb', line 13

def self.included(base)
  base.extend ::Leap::Subject

  base.decide :emission, :with => :characteristics do
    committee :emission do
      quorum 'from impacts', :needs => :impacts do |characteristics|
        characteristics[:impacts].to_a.sum
      end
    end

    committee :impacts do
      quorum 'from economic flows and impact vectors', :needs => [:economic_flows, :impact_vectors] do |characteristics|
        characteristics[:impact_vectors] * characteristics[:economic_flows]
      end
    end

    committee :impact_vectors do
      quorum 'from database' do
        adapter = BrighterPlanet::Purchase.impact_vectors_adapter
        adapter.matrix
      end
    end

    committee :economic_flows do
      quorum 'from sector shares, a', :needs => [:sector_shares, :sector_direct_requirements] do |characteristics|
        y = characteristics[:sector_shares]
        leonteif_inverse = characteristics[:sector_direct_requirements]
        leonteif_inverse * y
      end
    end

    committee :sector_direct_requirements do
      quorum 'from database' do
        adapter = BrighterPlanet::Purchase.sector_direct_requirements_adapter
        adapter.matrix
      end
    end
    
    committee :sector_shares do
      quorum 'from industry sector shares', :needs => :industry_sector_shares do |characteristics|
        shares = BrighterPlanet::Purchase.key_map.map do |key|
          characteristics[:industry_sector_shares][key] || 0
        end
        Vector[*shares]
      end
    end

    committee :industry_sector_shares do
      quorum 'from industry sector ratios', :needs => [:industry_sector_ratios, :adjusted_cost] do |characteristics|
        characteristics[:industry_sector_ratios].inject({}) do |new_ratios, (io_code, ratio)|
          new_ratios[io_code] ||= 0
          new_ratios[io_code] += ratio * characteristics[:adjusted_cost]
          new_ratios
        end
      end
    end

    committee :industry_sector_ratios do
      quorum 'from industry ratios', :needs => :industry_ratios do |characteristics|
        naics_codes = characteristics[:industry_ratios].keys
        industry_sectors = IndustrySector.where(:naics_code => naics_codes)
        characteristics[:industry_ratios].inject({}) do |new_ratios, (naics_code, ratio)|
          industry_sectors.
            find_all { |i| i.naics_code == naics_code }.
            each do |industry_sector|
            new_ratios[industry_sector.io_code] ||= 0
            new_ratio = ratio * industry_sector.ratio
            new_ratios[industry_sector.io_code] += new_ratio
          end
          new_ratios
        end
      end
    end

    # industries = the industries needed to produce the purchased item
    # ratios = the portion of the purchase amount that goes to each industry
    committee :industry_ratios do
      quorum 'from non trade industry and industry product ratios', :needs => [:non_trade_industry_ratios, :industry_product_ratios] do |characteristics|
        combined_ratios = characteristics[:non_trade_industry_ratios].
          merge(characteristics[:industry_product_ratios]) do |key, non_trade, ip_ratio|
            non_trade + ip_ratio
          end
      end
    end

    committee :industry_product_ratios do
      quorum 'from product line industry product ratios', :needs => :product_line_industry_product_ratios do |characteristics|
        naics_product_codes = characteristics[:product_line_industry_product_ratios].keys
        industry_products = IndustryProduct.where(:naics_product_code => naics_product_codes)
        characteristics[:product_line_industry_product_ratios].inject({}) do |new_ratios, (naics_product_code, ratio)|
          industry_products.
            find_all { |i| i.naics_product_code == naics_product_code }.
            each do |industry_product|
            new_ratios[industry_product.naics_code] ||= 0
            new_ratios[industry_product.naics_code] += ratio
          end
          new_ratios
        end
      end
    end

    committee :product_line_industry_product_ratios do
      quorum 'from product line ratios', :needs => :product_line_ratios do |characteristics|
        ps_codes = characteristics[:product_line_ratios].keys
        plips = ProductLineIndustryProduct.where(:ps_code => ps_codes)
        characteristics[:product_line_ratios].inject({}) do |new_ratios, (ps_code, ratio)|
          plips.find_all { |p| p.ps_code == ps_code }.each do |plip|
            new_ratios[plip.naics_product_code] ||= 0
            new_ratio = ratio * plip.ratio
            new_ratios[plip.naics_product_code] += new_ratio
          end
          new_ratios
        end
      end
    end

    committee :product_line_ratios do
      quorum 'from trade industry ratios', :needs => :trade_industry_ratios do |characteristics|
        naics_codes = characteristics[:trade_industry_ratios].keys
        industry_product_lines = IndustryProductLine.where(:naics_code => naics_codes)
        characteristics[:trade_industry_ratios].inject({}) do |new_ratios, (naics, ratio)|
          industry_product_lines.
            find_all { |i| i.naics_code == naics}.
            each do |industry_product_line|
            new_ratios[industry_product_line.ps_code] ||= 0
            new_ratio = ratio * industry_product_line.ratio
            new_ratios[industry_product_line.ps_code] += new_ratio
          end
          new_ratios
        end
      end
    end

    committee :non_trade_industry_ratios do
      quorum 'from industry', :needs => :industry do |characteristics|
        if characteristics[:industry].trade_industry?
          {}
        else
          { characteristics[:industry].naics_code.to_s => 1 }
        end
      end

      quorum 'from merchant category industries', :needs => :merchant_category_industries do |characteristics|
        characteristics[:merchant_category_industries].
          reject { |mci| mci.industry.trade_industry? }.inject({}) do |ntir, merchant_category_industry|
            ntir[merchant_category_industry.naics_code] ||= 0
            ntir[merchant_category_industry.naics_code] += merchant_category_industry.ratio
            ntir
        end
      end
      
      # NAICS 339991 chosen because it's emissions intensity is close to the average of the entire U.S. economy
      # (calculated by multiplying each sector's emissions intensity by it's share of total 2002 value)
      quorum 'default' do
        { '339991' => 1 }
      end
    end

    committee :trade_industry_ratios do
      quorum 'from industry', :needs => :industry do |characteristics|
        if characteristics[:industry].trade_industry?
          { characteristics[:industry].naics_code.to_s => 1 }
        else
          {}
        end
      end

      quorum 'from merchant category industries', :needs => :merchant_category_industries do |characteristics|
        characteristics[:merchant_category_industries].
          select { |mci| mci.industry.trade_industry? }.inject({}) do |tir, merchant_category_industry|
            tir[merchant_category_industry.naics_code] ||= 0
            tir[merchant_category_industry.naics_code] += merchant_category_industry.ratio
            tir
        end
      end
      
      quorum 'default' do
        {}
      end
    end

    # a dictionary to go from merchant categories to industries
    committee :merchant_category_industries do
      quorum 'from merchant category', :needs => :merchant_category do |characteristics|
        characteristics[:merchant_category].merchant_category_industries
      end
    end

    committee :merchant_category do
      quorum 'from merchant', :needs => [:merchant] do |characteristics|
        characteristics[:merchant].merchant_category
      end
    end
    
    committee :adjusted_cost do
      quorum 'from cost and date', :needs => [:cost, :date] do |characteristics|
        # FIXME TODO: Import CPI conversions
        @cpi_lookup ||= { 
          2009 => 1.189, 2010 => 1.207, 2011 => 1.225, 2012 => 1.245, 
          2013 => 1.265 }

        date = characteristics[:date]
        date = date.is_a?(String) ? Date.parse(date) : date
        conversion_factor = @cpi_lookup[date.year] || 1.207

        characteristics[:cost].to_f / conversion_factor
      end
      
      # This is the average federal government purchase card transaction in 2003, converted to 2002 dollars, with tax taken out
      # See http://www.sba.gov/advo/research/rs226tot.pdf
      quorum 'default' do
        517
      end
    end
      
    committee :cost do
      quorum 'from purchase amount and tax', :needs => [:purchase_amount, :tax] do |characteristics|
        characteristics[:purchase_amount].to_f - characteristics[:tax].to_f
      end
      
      # Based on http://www.thestc.com/STrates.stm weighted by US Census 2010 projected state population (exclude samoa, guam, pr)
      quorum 'from purchase amount', :needs => :purchase_amount do |characteristics|
        characteristics[:purchase_amount].to_f / 1.0711
      end
    end

    committee :date do
      quorum 'default' do
        Date.today
      end
    end
  end
end